Malicious PDF — malware analysis report

Static analysis result for SHA-256 13687f2f2a2e1ce5…

MALICIOUS

PDF

34.1 KB Created: 2021-06-18 13:50:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f428490d2fb393d407979d52df08cfbb SHA-1: 799b31ad7a36d6398aaaf774877a0748bfa23d2c SHA-256: 13687f2f2a2e1ce5bc4a73d70c476fbc9ca30a94c009529d91f0cbdd5b5e881a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users with promises of game hacks and free currency, ultimately redirecting them to malicious sites. The heuristic firings indicate a malicious redirector and a link farm, suggesting a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.co/app/431946152/cheat-roblox-lumber-tycoon-2-terbang-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/google-site-get-free-robux-roblox-easy_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-hack-a-person-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/what-is-tiktok-make-your-day_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-make-your-own-game-with-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-badge-hack_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-install-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-hack-download-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-retrieve-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-free-tips-apk_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-hacking-script-hub_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-hack-2021-working_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-gucci-jacket-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-online-free-no-sign-in_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-prison-life-cheat-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-free-vip-servers-mad-city_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFA 21820 bytes
SHA-256: 1ca71d6fc47d21ed7ec78bc317a265736606732ec2396c21665483219ebdf96d
font_01_sfnt_off00005f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F57 19276 bytes
SHA-256: d350ee59f08319f7e6c4c1c57e55199a176ee7cb1af31f799e46e2dcc24f0e62

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